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References in periodicals archive ?
The less crowded link alleviates congestion and eventually reduces the link error rate due to fewer collisions.
It is well-known that conventional TCP protocols suffer from throughput performance degradation in satellite networks seriously due to the high link error rate, long propagation delay, and large bandwidth-delay product (BDP) of satellite channels [10].
It means that we must introduce enough packets to cope with link error rates. ATCS adopts an intelligent approach and dynamically adjusts its redundancy degree factor according to real-time link error rate measurements.
Note that the redundant factor R can be zero when the estimated link error rate is zero.
The proposed algorithm utilizes network coding to introduce information redundancy to cope with link error rate over satellite IP networks.
Both results indicate the same characteristic that unacknowledged unicasting responds more sensitively to link error rate.
Since unacknowledged unicasting does not recover a frame error, a high link error rate causes lots of packet losses at TCP, and thus the window is decreased too frequently to be up to available capacity.
For the link error rate, 1><[10.sup.-6] BER is set for the low and 5><[10.sup.-6] BER is for the high, which approximately correspond to small room and outside room wireless LAN in the previous experiment, respectively.
The link error rate is also easily obtainable because almost all LAN drivers of modern operating systems maintain an average frame error rate for diagnosis utilities.
Hence, we propose TCP NJ+, showing up to 5% high BER wireless link error rate, it outperforms other TCP variants by 19% to 104% in terms of goodput regardless of background traffic when the network is in bi-directional congestion.
Especially, in 5% wireless link error rate, TCP NJ+ highly outperforms TCP New Jersey by 19% and TCP Westwood by 54%.
Especially, TCP NJ+ outperforms New Jersey by 24% and Westwood by 75% in 5% wireless link error rate with forward background traffic for congestive or non-congestive states.